I have tried both in LibreOffice 6.4 under Linux Mint and LibreOffice 7.0 under Windows10. When I RMB clic on a chart in Calc and select > Export as image > PDF, it does not work. EPS and PNG formats do work properly, the PDF file has 0 bytes.
There is a bug report: fdo#111392
Hello,
Try this. Select the chart. Then from menu → File->Export as PDF
. Make sure Range
has Selection/Selected sheets
selected.